Many owners, especially Audi and BMW owners, will always encounter such a situation: “In the process of driving, suddenly it crashes, loses its power, refuels without power, and the idle speed suddenly rises and falls, and the fault light signals a gearbox failure.” Every time this happens, the owner of the car must be in a cold sweat, especially when driving at a high speed, because this situation can easily lead to rear-end collisions and traffic accidents. In serious cases, it may lead to life threats.
However, the gearbox crashes, but it is not a good solution to the problem; 4s stores and garages tend to treat owners like this: First, detection, but often can not find the fault code; second is to upgrade the computer program; third is the valve body failure, Need to be replaced; in most cases it is impossible to find the cause of the malfunction and do not know how to solve it, and some of them are the direct replacement of the valve body, so that the owner of the vehicle spends a lot of money and, in the end, still cannot solve the problem of setbacks.
What caused the transmission to crash?
The gearbox stalled, especially the automatic gearbox, mainly due to upshifts or downshifts. There was a feeling of rattling and slamming when slamming. The change in gear position of the automatic transmission was controlled by ATF hydraulics and solenoid valve body. And other control units; once the valve body and ATF oil problems, it will inevitably lead to gearbox failure.
However, the failure of the valve body is not the damage of the valve body; it is not at the point where it is replaced or replaced.
Under normal circumstances, the root cause of the gearbox's setback is that when the gearbox temperature rises, the ATF starts to oxidize, turning brown and emitting a scorched bread. High temperatures will destroy the mass and friction characteristics of ATF, increase friction and wear, and at the same time, sludge (impurities or dirt) will also be generated inside the gearbox (such as the valve body), resulting in blockage of the valve body and pipeline, and cannot be achieved in sequence. The adjustment of oil pressure caused a sudden turn-down of the gearbox;
From here, we can see that simply replacing the valve body, although it costs a lot, it cannot solve the problem of deterioration of the gearbox; there are also riders think, replace the new transmission oil, to solve the problem of dirty transmission, However, in fact, the pollution and impurities formed in the gearbox and the blockage of the valve body are difficult to solve by replacing the transmission oil. Many riders have also proved that the gearbox oil alone cannot be solved by its own practice. The problem of gearbox setbacks.
According to a number of high-end owners such as Audi and BMW, the gearboxes of these vehicles are not well cleaned in the 4s shop or auto repair factory.
